More bad news about trans fats: A study published in PLOS ONE on Wednesday links worsened memory function to higher consumption of trans fatty acids.

Used in processed foods to improve taste, texture and shelf life, trans fats have become enemy No. 1 for many American dieters. Found in everything from crackers and cookies to frozen pizzas, they has been found to raise "bad" LDL cholesterol, your risk of heart disease, stroke and certain cancers.